.box {
    border-style: solid;
    border-color: rgb(76,175,80);
    width: 250px;
    height: 700px;
    margin: auto;
    vertical-align: middle;
}
.dropbtn {
    width: 180px;
    height: 120px;
    border-style: none;
    margin-top: 50px;
    margin-left: 18px;
    margin-right: 80px;
    padding: 0;
    background-color: rgb(243,243,243);
    font-size:30px;
}
.dropdown{
    position: relative;
    display: inline-block;
}
.dropdownmenu {
    display: none;
    position: absolute;
    background-color: rgb(243,243,243);
    margin-left: 18px;
}
.dropdownmenu a {
    display: block;
    width: 180px;
    height: 120px;
    color: black;
    border-style: none;
    text-decoration: none;
    text-align: center;
    line-height: 120px;
    background-color: rgb(243,243,243);
    font-size:30px;
}
li {
    list-style: none;
    color: black;
}
.dropdown:hover .dropbtn{
    background-color: rgb(76,175,80);
    border-radius: 10px;
}
.dropdown:hover .dropdownmenu {
    display: block;
}
a:hover {
    background-color: rgb(76,175,80);
    border-radius: 10px;
}